Q: Blower motor whine

asked by on October 05, 2016

Hello. I've just replaced the blower motor (fan motor) and when I turn the air on there is a whine/hum which increases in pitch when I turn the fan setting up. Is it normal for the fan motor to rub against the blower motor housing? I noticed when I turn the fan blades manually, there is resistance against the housing. If so how cold I fix it? The part is proper size. Perhaps theres sone thing in the way or perhaps it was reassembled improperly enough to cause this. If it's normal then I'm not sure what it could be. The resistor is fine but if it isn't, is here a way to check if it's damaged or not? It looks fine. Thank you

My car has 216000 miles.
My car has a manual transmission.

Hello, thank you for writing in. If it is an aftermarket blower motor, as opposed to an OEM original dealer part, that might account for the noise. That would be my first suspicion, especially if you are sure you have otherwise installed it correctly. Aftermarket parts can often be very problematic and in many cases are dramatically different (inferior) compared to the OEM part. One way to test for a defect is to operate the fan outside of the car in free air and evaluate the noise level. If the fan is clearly noisy as well, the part is simply no good. If it is an OEM part but noisy, you might have a defective unit or you might not have installed it properly. Depending on what your circumstances are (i.e., if you end up obtaining a replacement motor) feel free to inquire further; YourMechanic is mobile and can assist you with the installation by coming to your home or office.

Was this answer helpful?
The statements expressed above are only for informational purposes and should be independently verified. Please see our terms of service for more details

Get an instant quote for your car

Our certified mechanics come to you ・Backed by 12-month, 12,000-mile guarantee・Fair and transparent pricing

Get a quote

What others are asking

The front passenger floor board in my car is damp, and the windows fog up on the inside

Have the A/C system checked to see if the drain is clear for the A/C evaporator case. If you park under or around trees that shed a lot then it can get debris into the A/C and clog the drain,...

Has juice but does nothing when you turn the key

Hello. A no crank condition can be caused by a few things. A few common causes are a bad ignition switch, starter relay, or starter. It may be possible that the ignition switch is worn out and no longer functions...

My Toyota Will not move in reverse when the engine is hot

If your car will reverse in when cold but not when hot, it's likely that you're looking at a mechanical failure in the transmission. automatic transmissions use hydraulic pressure to operate the various clutches and bands that shift the gears....

Related articles

How Long Does a Blower Motor Relay Last?
During During the summer months, there is nothing more important to a car owner than a properly working air conditioner system. Most car owners are unaware about just how many components have to work together in order for cold air...
Will Coilovers Improve My Car's Handling?
In In the land of aftermarket suspensions there are spring kits, air bag kits, adjustable shocks and struts, and a variety of other approaches to improving handling and/or changing ride height, but when the subject is improving high-speed handling, the...
Symptoms of a Bad or Failing Heater Blower Motor Resistor
Common signs include the car's heater not working or getting stuck on a certain speed, or something getting jammed in the blower motor.